/*
 * ═══════════════════════════════════════════════════════════
 * EXAM ENGINE — Design System & Component Styles
 * Scott's English Success — In-House Exam System
 * ═══════════════════════════════════════════════════════════
 *
 * This CSS provides a complete design system for exam content pages.
 * Content authors use semantic class names; responsive behavior is automatic.
 *
 * BLOCKS:
 *   .exam-page          — Full page wrapper
 *   .exam-passage        — Reading passage / content block
 *   .exam-questions      — Question container
 *   .question-group      — Single question wrapper (data-question="q1")
 *   .exam-instruction    — Instruction/info block
 *   .exam-media          — YouTube / audio embed wrapper
 *   .exam-nav            — Next/Back navigation bar
 *   .exam-progress       — Progress indicator
 *   .exam-timer-field    — Timer self-report field
 *   .exam-status-bar     — Top status bar (user info, save indicator)
 *
 * QUESTION TYPES:
 *   .q-radio             — Radio group (MCQ, T/F/NG)
 *   .q-text              — Short text input
 *   .q-textarea          — Long text / essay
 *   .q-dropdown          — Dropdown select
 */

/* ─── CSS Custom Properties (Design Tokens) ─── */
:root {
    /* Colors */
    --exam-bg: #0f1419;
    --exam-surface: #1a2029;
    --exam-surface-hover: #222b36;
    --exam-surface-active: #2a3544;
    --exam-border: #2d3748;
    --exam-border-focus: #4a9eff;
    --exam-text: #e8eaed;
    --exam-text-secondary: #9ca3af;
    --exam-text-muted: #6b7280;
    --exam-accent: #4a9eff;
    --exam-accent-hover: #3b8fee;
    --exam-success: #34d399;
    --exam-warning: #fbbf24;
    --exam-error: #f87171;
    --exam-passage-bg: #161d26;
    --exam-passage-border: #2a3a50;

    /* Typography */
    --exam-font: 'Montserrat', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --exam-font-mono: 'Courier New', monospace;
    --exam-fs-xs: 0.75rem;
    --exam-fs-sm: 0.875rem;
    --exam-fs-base: 1rem;
    --exam-fs-lg: 1.125rem;
    --exam-fs-xl: 1.25rem;
    --exam-fs-2xl: 1.5rem;
    --exam-fs-3xl: 1.875rem;
    --exam-lh: 1.65;

    /* Spacing */
    --exam-space-xs: 0.25rem;
    --exam-space-sm: 0.5rem;
    --exam-space-md: 1rem;
    --exam-space-lg: 1.5rem;
    --exam-space-xl: 2rem;
    --exam-space-2xl: 3rem;

    /* Radius */
    --exam-radius-sm: 6px;
    --exam-radius-md: 10px;
    --exam-radius-lg: 14px;

    /* Shadows */
    --exam-shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.3);
    --exam-shadow-md: 0 4px 12px rgba(0, 0, 0, 0.4);
    --exam-shadow-lg: 0 8px 30px rgba(0, 0, 0, 0.5);

    /* Transitions */
    --exam-transition: 0.2s ease;
}


/* ═══════════════════════════════════════════════════════════
   PAGE WRAPPER
   ═══════════════════════════════════════════════════════════ */

.exam-page {
    font-family: var(--exam-font);
    background: var(--exam-bg);
    color: var(--exam-text);
    line-height: var(--exam-lh);
    min-height: 100vh;
    padding: 0;
    margin: 0;
    font-size: var(--exam-fs-base);
    -webkit-font-smoothing: antialiased;
}

.exam-page *,
.exam-page *::before,
.exam-page *::after {
    box-sizing: border-box;
}

.exam-page-inner {
    max-width: 900px;
    margin: 0 auto;
    padding: var(--exam-space-lg) var(--exam-space-md);
    transition: max-width var(--exam-transition);
}

/* Fluid layout for panes */
[data-pane="left"] .exam-page-inner,
[data-pane="right"] .exam-page-inner {
    max-width: 100%;
    margin: 0;
}

/* Hide elements based on pane */
[data-pane="left"] .exam-questions,
[data-pane="left"] .exam-instruction,
[data-pane="left"] .exam-progress {
    display: none !important;
}

[data-pane="right"] .exam-passage {
    display: none !important;
}

/* Clean up status bar in left pane */
[data-pane="left"] .exam-status-bar {
    display: none;
}

/* ─── Split Layout Support ─── */
@media (min-width: 1024px) {
    .exam-layout-split.exam-page-inner {
        max-width: 1600px;
        display: grid;
        grid-template-columns: 1fr 1fr;
        gap: 0;
        align-items: start;
        padding: 0;
        /* Full height layout */
    }

    .exam-layout-split .exam-passage {
        grid-column: 1;
        grid-row: 1 / span 100;
        position: sticky;
        top: 50px;
        /* Offset by status bar */
        height: calc(100vh - 50px);
        overflow-y: auto;
        margin-bottom: 0;
        padding: var(--exam-space-xl);
        background: var(--exam-passage-bg);
        border-right: 1px solid var(--exam-border);
        border-radius: 0;
    }

    .exam-layout-split>*:not(.exam-passage) {
        grid-column: 2;
        padding-left: var(--exam-space-xl);
        padding-right: var(--exam-space-xl);
    }

    .exam-layout-split .exam-instruction {
        margin-top: var(--exam-space-xl);
    }

    .exam-layout-split .exam-nav {
        grid-column: 2;
        margin-top: var(--exam-space-lg);
        padding-bottom: var(--exam-space-2xl);
    }
}


/* ═══════════════════════════════════════════════════════════
   STATUS BAR (top: user info, save indicator, progress)
   ═══════════════════════════════════════════════════════════ */

.exam-status-bar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: var(--exam-space-sm);
    padding: var(--exam-space-sm) var(--exam-space-md);
    background: var(--exam-surface);
    border-bottom: 1px solid var(--exam-border);
    font-size: var(--exam-fs-sm);
    color: var(--exam-text-secondary);
    position: sticky;
    top: 0;
    z-index: 100;
}

.exam-status-bar .user-info {
    display: flex;
    align-items: center;
    gap: var(--exam-space-sm);
    flex: 1;
}

.exam-status-bar .btn-native-logout {
    margin-left: var(--exam-space-md);
    background: transparent;
    border: 1px solid var(--exam-border);
    color: var(--exam-text-secondary);
    padding: 4px 10px;
    border-radius: var(--exam-radius-sm);
    font-size: var(--exam-fs-xs);
    font-weight: 500;
    cursor: pointer;
    display: inline-flex;
    align-items: center;
    transition: all var(--exam-transition);
}

.exam-status-bar .btn-native-logout:hover {
    background: #fee2e2;
    border-color: #f87171;
    color: #ef4444;
}

.exam-status-bar .btn-native-logout:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.exam-status-bar .nav-control {
    flex: 0 0 auto;
    display: flex;
    justify-content: center;
}

.exam-status-bar .user-avatar {
    width: 28px;
    height: 28px;
    border-radius: 50%;
    background: var(--exam-accent);
    color: #fff;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-size: var(--exam-fs-xs);
    text-transform: uppercase;
}

.exam-status-bar .save-indicator {
    display: flex;
    align-items: center;
    gap: 6px;
    flex: 1;
    justify-content: flex-end;
}

.exam-status-bar .save-dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: var(--exam-text-muted);
    transition: background var(--exam-transition);
}

.exam-status-bar .save-dot.saving {
    background: var(--exam-warning);
    animation: pulse-dot 1s infinite;
}

.exam-status-bar .save-dot.saved {
    background: var(--exam-success);
}

@media (max-width: 600px) {
    .exam-status-bar {
        padding: 8px 10px;
        gap: 6px;
    }
    .exam-status-bar .user-info {
        gap: 6px;
        min-width: 0;
    }
    .exam-status-bar .user-info > span {
        white-space: nowrap;
        overflow: hidden;
        text-overflow: ellipsis;
        max-width: 90px;
    }
    .exam-status-bar .btn-native-logout {
        margin-left: 6px;
        padding: 4px 6px;
    }
    .exam-status-bar .btn-native-logout svg {
        margin-right: 2px !important;
    }
    .exam-status-bar .save-indicator {
        gap: 4px;
        flex: 0 0 auto;
    }
    .exam-status-bar .btn-nav-map {
        padding: 4px 8px;
    }
}

.exam-status-bar .save-dot.error {
    background: var(--exam-error);
    box-shadow: 0 0 8px rgba(248, 113, 113, 0.4);
    animation: save-dot-blink 1s infinite alternate;
}

@keyframes save-dot-blink {
    from {
        opacity: 1;
        transform: scale(1);
    }

    to {
        opacity: 0.5;
        transform: scale(0.8);
    }
}

@keyframes pulse-dot {

    0%,
    100% {
        opacity: 1;
    }

    50% {
        opacity: 0.4;
    }
}


/* ═══════════════════════════════════════════════════════════
   PROGRESS BAR
   ═══════════════════════════════════════════════════════════ */

.exam-progress {
    display: flex;
    align-items: center;
    gap: var(--exam-space-md);
    padding: var(--exam-space-md);
    margin-bottom: var(--exam-space-lg);
}

.exam-progress-bar {
    flex: 1;
    height: 6px;
    background: var(--exam-border);
    border-radius: 3px;
    overflow: hidden;
}

.exam-progress-fill {
    height: 100%;
    background: linear-gradient(90deg, var(--exam-accent), var(--exam-success));
    border-radius: 3px;
    transition: width 0.4s ease;
    width: 0%;
}

.exam-progress-text {
    font-size: var(--exam-fs-sm);
    color: var(--exam-text-secondary);
    white-space: nowrap;
    min-width: 90px;
    text-align: right;
}


/* ═══════════════════════════════════════════════════════════
   PASSAGE BLOCK — Reading content
   ═══════════════════════════════════════════════════════════ */

.exam-passage {
    background: var(--exam-passage-bg);
    border: 1px solid var(--exam-passage-border);
    border-radius: var(--exam-radius-lg);
    padding: var(--exam-space-xl);
    margin-bottom: var(--exam-space-xl);
    line-height: 1.8;
}

.exam-passage h3,
.exam-passage .passage-title {
    font-size: var(--exam-fs-xl);
    font-weight: 700;
    color: var(--exam-accent);
    margin: 0 0 var(--exam-space-lg) 0;
    padding-bottom: var(--exam-space-sm);
    border-bottom: 2px solid var(--exam-accent);
    display: inline-block;
}

.exam-passage h4,
.exam-passage .passage-subtitle {
    font-size: var(--exam-fs-lg);
    font-weight: 600;
    color: var(--exam-text);
    margin: var(--exam-space-lg) 0 var(--exam-space-sm) 0;
}

.exam-passage p {
    margin: var(--exam-space-sm) 0;
    color: var(--exam-text);
}

.exam-passage strong {
    color: #fff;
    font-weight: 600;
}

.exam-passage em {
    color: var(--exam-text-secondary);
    font-style: italic;
}

.exam-passage table {
    width: 100%;
    border-collapse: collapse;
    margin: var(--exam-space-md) 0;
    font-size: var(--exam-fs-sm);
}

.exam-passage table th,
.exam-passage table td {
    padding: var(--exam-space-sm) var(--exam-space-md);
    border: 1px solid var(--exam-border);
    text-align: left;
}

.exam-passage table th {
    background: var(--exam-surface);
    font-weight: 600;
    color: var(--exam-accent);
}

.exam-passage table tr:nth-child(even) {
    background: rgba(255, 255, 255, 0.02);
}

.exam-passage ul,
.exam-passage ol {
    padding-left: var(--exam-space-lg);
    margin: var(--exam-space-sm) 0;
}

.exam-passage li {
    margin-bottom: var(--exam-space-xs);
}

/* ─── Reading Passage Content Specifics ─── */
.section-meta {
    margin-bottom: var(--exam-space-lg);
    border-bottom: 1px solid var(--exam-border);
    padding-bottom: var(--exam-space-sm);
}

.section-meta h3 {
    margin: 0;
    color: var(--exam-accent);
}

.passage-sub-section {
    margin-bottom: var(--exam-space-xl);
}

.passage-sub-section .sub-title {
    margin-bottom: var(--exam-space-xs);
    color: var(--exam-accent);
    text-transform: uppercase;
    font-size: var(--exam-fs-sm);
    letter-spacing: 0.5px;
}

.passage-note {
    background: rgba(255, 255, 255, 0.03);
    padding: var(--exam-space-md);
    border-radius: var(--exam-radius-sm);
    border-left: 2px solid var(--exam-warning);
    font-style: italic;
}


/* ═══════════════════════════════════════════════════════════
   INSTRUCTION BLOCK
   ═══════════════════════════════════════════════════════════ */

.exam-instruction {
    background: linear-gradient(135deg, rgba(74, 158, 255, 0.08), rgba(74, 158, 255, 0.03));
    border-left: 4px solid var(--exam-accent);
    border-radius: 0 var(--exam-radius-sm) var(--exam-radius-sm) 0;
    padding: var(--exam-space-md) var(--exam-space-lg);
    margin-bottom: var(--exam-space-lg);
    font-size: var(--exam-fs-sm);
    color: var(--exam-text-secondary);
    line-height: 1.6;
}

.exam-instruction strong {
    color: var(--exam-text);
}


/* ═══════════════════════════════════════════════════════════
   QUESTION GROUP — Wraps a single question
   ═══════════════════════════════════════════════════════════ */

.exam-questions {
    margin-bottom: var(--exam-space-xl);
}

.question-group {
    background: var(--exam-surface);
    border: 1px solid var(--exam-border);
    border-radius: var(--exam-radius-md);
    padding: var(--exam-space-lg);
    margin-bottom: var(--exam-space-md);
    transition: border-color var(--exam-transition), box-shadow var(--exam-transition);
}

.question-group:hover {
    border-color: var(--exam-border-focus);
}

.question-group.answered {
    border-color: var(--exam-success);
    box-shadow: 0 0 0 1px var(--exam-success);
}

.question-group.active {
    border-color: var(--exam-accent);
    box-shadow: 0 0 0 2px rgba(74, 158, 255, 0.2);
}

.question-number {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 30px;
    height: 30px;
    border-radius: 50%;
    background: var(--exam-accent);
    color: #fff;
    font-weight: 700;
    font-size: var(--exam-fs-sm);
    margin-right: var(--exam-space-sm);
    flex-shrink: 0;
}

.question-group.answered .question-number {
    background: var(--exam-success);
}

.question-text {
    font-size: var(--exam-fs-base);
    color: var(--exam-text);
    margin: 0 0 var(--exam-space-md) 0;
    font-weight: 500;
    display: flex;
    align-items: flex-start;
    gap: var(--exam-space-sm);
}

.question-text .q-num {
    /* For inline question numbering without the circle */
    font-weight: 700;
    color: var(--exam-accent);
    min-width: 25px;
}


/* ═══════════════════════════════════════════════════════════
   RADIO GROUP — MCQ, True/False/Not Given
   ═══════════════════════════════════════════════════════════ */

.q-radio {
    display: flex;
    flex-direction: column;
    gap: var(--exam-space-sm);
}

.q-radio label {
    display: flex;
    align-items: center;
    gap: var(--exam-space-sm);
    padding: var(--exam-space-sm) var(--exam-space-md);
    border: 1px solid var(--exam-border);
    border-radius: var(--exam-radius-sm);
    cursor: pointer;
    transition: all var(--exam-transition);
    font-size: var(--exam-fs-sm);
    color: var(--exam-text);
    user-select: none;
}

.q-radio label:hover {
    background: var(--exam-surface-hover);
    border-color: var(--exam-border-focus);
}

.q-radio input[type="radio"] {
    width: 18px;
    height: 18px;
    accent-color: var(--exam-accent);
    cursor: pointer;
    flex-shrink: 0;
}

.q-radio label.is-checked,
.q-radio label:has(input:checked) {
    background: rgba(74, 158, 255, 0.1);
    border-color: var(--exam-accent);
    color: #fff;
}

/* Fallback for when label style is preferred but :has isn't supported */
.q-radio input[type="radio"]:checked+span {
    color: var(--exam-accent);
    font-weight: 600;
}

/* Horizontal radio (for T/F/NG on wider screens) */
.q-radio.q-radio--horizontal {
    flex-direction: row;
    flex-wrap: wrap;
}

.q-radio.q-radio--horizontal label {
    flex: 1;
    min-width: 120px;
    justify-content: center;
    text-align: center;
}


/* ═══════════════════════════════════════════════════════════
   TEXT INPUT — Short answer
   ═══════════════════════════════════════════════════════════ */

.q-text input[type="text"] {
    width: 100%;
    padding: var(--exam-space-sm) var(--exam-space-md);
    background: var(--exam-surface-hover);
    border: 1px solid var(--exam-border);
    border-radius: var(--exam-radius-sm);
    color: var(--exam-text);
    font-family: var(--exam-font);
    font-size: var(--exam-fs-base);
    transition: border-color var(--exam-transition), box-shadow var(--exam-transition);
    outline: none;
}

.q-text input[type="text"]:focus {
    border-color: var(--exam-accent);
    box-shadow: 0 0 0 3px rgba(74, 158, 255, 0.15);
}

.q-text input[type="text"]::placeholder {
    color: var(--exam-text-muted);
}

.q-text .char-hint {
    font-size: var(--exam-fs-xs);
    color: var(--exam-text-muted);
    margin-top: var(--exam-space-xs);
    display: none !important;
}


/* ═══════════════════════════════════════════════════════════
   TEXTAREA — Long answer / Essay
   ═══════════════════════════════════════════════════════════ */

.q-textarea textarea {
    width: 100%;
    min-height: 200px;
    padding: var(--exam-space-md);
    background: var(--exam-surface-hover);
    border: 1px solid var(--exam-border);
    border-radius: var(--exam-radius-sm);
    color: var(--exam-text);
    font-family: var(--exam-font);
    font-size: var(--exam-fs-base);
    line-height: 1.7;
    resize: vertical;
    transition: border-color var(--exam-transition), box-shadow var(--exam-transition);
    outline: none;
}

.q-textarea textarea:focus {
    border-color: var(--exam-accent);
    box-shadow: 0 0 0 3px rgba(74, 158, 255, 0.15);
}

.q-textarea .word-count {
    display: flex;
    justify-content: flex-end;
    font-size: var(--exam-fs-xs);
    color: var(--exam-text-muted);
    margin-top: var(--exam-space-xs);
    gap: var(--exam-space-md);
}

.q-textarea .word-count .count {
    color: var(--exam-accent);
    font-weight: 600;
}

.q-textarea .word-count .count.over-limit {
    color: var(--exam-error);
}


/* ═══════════════════════════════════════════════════════════
   DROPDOWN — Select matching
   ═══════════════════════════════════════════════════════════ */

.q-dropdown select {
    width: 100%;
    max-width: 350px;
    padding: var(--exam-space-sm) var(--exam-space-md);
    background: var(--exam-surface-hover);
    border: 1px solid var(--exam-border);
    border-radius: var(--exam-radius-sm);
    color: var(--exam-text);
    font-family: var(--exam-font);
    font-size: var(--exam-fs-base);
    cursor: pointer;
    outline: none;
    transition: border-color var(--exam-transition);
    appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'%3E%3Cpath fill='%239ca3af' d='M6 8L1 3h10z'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 12px center;
    padding-right: 36px;
}

.q-dropdown select:focus {
    border-color: var(--exam-accent);
}

.q-dropdown select option {
    background: var(--exam-surface);
    color: var(--exam-text);
}


/* ═══════════════════════════════════════════════════════════
   MEDIA BLOCK — YouTube / Audio
   ═══════════════════════════════════════════════════════════ */

.exam-media {
    margin: var(--exam-space-lg) 0;
    border-radius: var(--exam-radius-md);
    overflow: hidden;
    background: #000;
}

.exam-media .video-wrapper {
    position: relative;
    padding-bottom: 56.25%;
    /* 16:9 */
    height: 0;
}

.exam-media .video-wrapper iframe {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    border: none;
}

.exam-media .media-label {
    padding: var(--exam-space-sm) var(--exam-space-md);
    background: var(--exam-surface);
    font-size: var(--exam-fs-sm);
    color: var(--exam-text-secondary);
}

.exam-media audio {
    width: 100%;
    margin: var(--exam-space-sm) 0;
}


/* ═══════════════════════════════════════════════════════════
   NAVIGATION BAR — Next / Back / Submit
   ═══════════════════════════════════════════════════════════ */

.exam-nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: var(--exam-space-md);
    padding: var(--exam-space-lg) 0;
    margin-top: var(--exam-space-xl);
    border-top: 1px solid var(--exam-border);
}

.exam-nav .btn-exam {
    display: inline-flex;
    align-items: center;
    gap: var(--exam-space-sm);
    padding: 12px 28px;
    border: none;
    border-radius: var(--exam-radius-sm);
    font-family: var(--exam-font);
    font-size: var(--exam-fs-base);
    font-weight: 600;
    cursor: pointer;
    transition: all var(--exam-transition);
    text-decoration: none;
}

.exam-nav .btn-back {
    background: var(--exam-surface);
    color: var(--exam-text-secondary);
    border: 1px solid var(--exam-border);
}

.exam-nav .btn-back:hover {
    background: var(--exam-surface-hover);
    color: var(--exam-text);
}

.exam-nav .btn-next {
    background: var(--exam-accent);
    color: #fff;
}

.exam-nav .btn-next:hover {
    background: var(--exam-accent-hover);
    transform: translateY(-1px);
    box-shadow: var(--exam-shadow-md);
}

.exam-nav .btn-submit {
    background: linear-gradient(135deg, var(--exam-success), #059669);
    color: #fff;
}

.exam-nav .btn-submit:hover {
    transform: translateY(-1px);
    box-shadow: var(--exam-shadow-lg);
}

.exam-nav .btn-exam:disabled {
    opacity: 0.4;
    cursor: not-allowed;
    transform: none;
}

.exam-nav .page-indicator-wrapper {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 4px;
}

.exam-nav .page-indicator {
    font-size: var(--exam-fs-sm);
    color: var(--exam-text-muted);
}

.btn-quick-nav {
    background: transparent;
    border: 1px solid var(--exam-border);
    border-radius: 4px;
    padding: 2px 8px;
    font-size: 0.8rem;
    cursor: pointer;
    color: var(--exam-text-secondary);
    display: flex;
    align-items: center;
    gap: 4px;
    transition: all var(--exam-transition);
}

.btn-quick-nav:hover {
    border-color: var(--exam-accent);
    color: var(--exam-accent);
    background: rgba(74, 158, 255, 0.1);
}


/* ═══════════════════════════════════════════════════════════
   TIMER SELF-REPORT FIELD
   ═══════════════════════════════════════════════════════════ */

.exam-timer-field {
    background: var(--exam-surface);
    border: 1px solid var(--exam-border);
    border-radius: var(--exam-radius-md);
    padding: var(--exam-space-lg);
    margin: var(--exam-space-lg) 0;
    text-align: center;
}

.exam-timer-field .timer-label {
    font-size: var(--exam-fs-lg);
    font-weight: 600;
    margin-bottom: var(--exam-space-md);
    color: var(--exam-text);
}


/* ═══════════════════════════════════════════════════════════
   SECTION DIVIDER
   ═══════════════════════════════════════════════════════════ */

.exam-divider {
    display: flex;
    align-items: center;
    gap: var(--exam-space-md);
    margin: var(--exam-space-2xl) 0;
    color: var(--exam-text-muted);
    font-size: var(--exam-fs-sm);
    text-transform: uppercase;
    letter-spacing: 1px;
}

.exam-divider::before,
.exam-divider::after {
    content: '';
    flex: 1;
    height: 1px;
    background: var(--exam-border);
}


/* ═══════════════════════════════════════════════════════════
   SUBMISSION COMPLETE / RESULTS
   ═══════════════════════════════════════════════════════════ */

.exam-complete {
    text-align: center;
    padding: var(--exam-space-2xl);
}

.exam-complete .complete-icon {
    font-size: 4rem;
    margin-bottom: var(--exam-space-lg);
}

.exam-complete h2 {
    font-size: var(--exam-fs-2xl);
    color: var(--exam-success);
    margin-bottom: var(--exam-space-md);
}

.exam-complete p {
    color: var(--exam-text-secondary);
    max-width: 500px;
    margin: 0 auto;
}


/* ═══════════════════════════════════════════════════════════
   LOGIN REQUIRED / ERROR STATES
   ═══════════════════════════════════════════════════════════ */

.exam-login-required,
.exam-error-state {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    min-height: 400px;
    text-align: center;
    padding: var(--exam-space-2xl);
}

.exam-login-required h2,
.exam-error-state h2 {
    font-size: var(--exam-fs-2xl);
    margin-bottom: var(--exam-space-md);
}

.exam-login-required p,
.exam-error-state p {
    color: var(--exam-text-secondary);
    margin-bottom: var(--exam-space-lg);
}

.exam-error-state h2 {
    color: var(--exam-error);
}


/* ═══════════════════════════════════════════════════════════
   LOADING STATE
   ═══════════════════════════════════════════════════════════ */

.exam-loading {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    min-height: 300px;
    gap: var(--exam-space-lg);
}

.exam-loading-spinner {
    width: 40px;
    height: 40px;
    border: 3px solid var(--exam-border);
    border-top-color: var(--exam-accent);
    border-radius: 50%;
    animation: exam-spin 0.8s linear infinite;
}

@keyframes exam-spin {
    to {
        transform: rotate(360deg);
    }
}

.exam-loading-text {
    color: var(--exam-text-secondary);
    font-size: var(--exam-fs-sm);
}


/* ═══════════════════════════════════════════════════════════
   RESPONSIVE — Tablet (≤768px)
   ═══════════════════════════════════════════════════════════ */

@media (max-width: 768px) {
    :root {
        --exam-fs-base: 0.9375rem;
        --exam-fs-lg: 1.0625rem;
        --exam-fs-xl: 1.125rem;
        --exam-fs-2xl: 1.375rem;
    }

    .exam-page-inner {
        padding: var(--exam-space-md) var(--exam-space-sm);
    }

    .exam-passage {
        padding: var(--exam-space-md);
        border-radius: var(--exam-radius-sm);
    }

    .question-group {
        padding: var(--exam-space-md);
    }

    .q-radio.q-radio--horizontal {
        flex-direction: column;
    }

    .exam-nav {
        flex-wrap: wrap;
    }

    .exam-nav .btn-exam {
        padding: 10px 20px;
        font-size: var(--exam-fs-sm);
    }

    .exam-status-bar {
        font-size: var(--exam-fs-xs);
        padding: var(--exam-space-xs) var(--exam-space-sm);
    }

    .exam-progress {
        padding: var(--exam-space-sm) var(--exam-space-md);
    }
}


/* ═══════════════════════════════════════════════════════════
   RESPONSIVE — Small phone (≤480px)
   ═══════════════════════════════════════════════════════════ */

@media (max-width: 480px) {
    :root {
        --exam-fs-base: 0.875rem;
        --exam-fs-lg: 1rem;
        --exam-fs-xl: 1.0625rem;
        --exam-fs-2xl: 1.25rem;
    }

    .exam-page-inner {
        padding: var(--exam-space-sm) var(--exam-space-xs);
    }

    .exam-passage {
        padding: var(--exam-space-sm);
    }

    .question-group {
        padding: var(--exam-space-sm);
        margin-bottom: var(--exam-space-sm);
    }

    .q-radio label {
        padding: var(--exam-space-xs) var(--exam-space-sm);
        font-size: var(--exam-fs-xs);
    }

    .exam-nav .btn-exam {
        padding: 8px 16px;
        font-size: var(--exam-fs-xs);
    }

    .exam-passage table {
        display: block;
        overflow-x: auto;
    }

    .question-number {
        width: 24px;
        height: 24px;
        font-size: 0.65rem;
    }
}


/* ═══════════════════════════════════════════════════════════
   PRINT STYLES
   ═══════════════════════════════════════════════════════════ */

@media print {

    .exam-status-bar,
    .exam-nav,
    .exam-progress {
        display: none;
    }

    .exam-page {
        background: #fff;
        color: #000;
    }

    .exam-passage,
    .question-group {
        border: 1px solid #ccc;
        background: #fff;
    }
}

/* ─── Premium Question Cards (IELTS Style) ─── */
.question-card {
    background: #1a1f26;
    border: 2px solid transparent;
    border-radius: var(--exam-radius-md);
    padding: var(--exam-space-lg);
    margin-bottom: var(--exam-space-md);
    transition: all var(--exam-transition);
}

.question-card.active,
.question-card.answered,
.question-card:has(input:checked) {
    border-color: #34d39933;
    /* Subtle green-tinted border */
}

/* No simple sibling fallback for parent question-card, but .answered class handles it via JS */

/* Question numbering and text */
.q-title-row {
    display: flex;
    align-items: center;
    gap: var(--exam-space-md);
    margin-bottom: var(--exam-space-lg);
}

.q-badge {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 32px;
    height: 32px;
    background: var(--exam-accent);
    /* Blue by default */
    color: #fff;
    border-radius: 50%;
    font-weight: 700;
    font-size: var(--exam-fs-base);
    flex-shrink: 0;
    transition: background var(--exam-transition);
}

.question-card.answered .q-badge,
.question-card:has(input:checked) .q-badge {
    background: var(--exam-success);
    /* Green only on answering */
}

/* Fallback for badge */
.question-card.answered .q-badge {
    background: var(--exam-success);
}

.q-text-content {
    flex: 1;
    font-size: var(--exam-fs-base);
    color: #fff;
    font-weight: 500;
}

/* Option Button Grouping */
.q-options-container {
    display: flex;
    gap: var(--exam-space-md);
    flex-wrap: wrap;
}

.q-option-btn {
    flex: 1;
    min-width: 140px;
    background: rgba(255, 255, 255, 0.03);
    border: 1px solid #2d3748;
    border-radius: var(--exam-radius-sm);
    padding: 12px 16px;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 12px;
    cursor: pointer;
    transition: all var(--exam-transition);
    user-select: none;
    color: #e2e8f0;
}

.q-option-btn:hover {
    background: rgba(255, 255, 255, 0.05);
}

/* Radio circle inside btn */
.q-radio-circle {
    width: 18px;
    height: 18px;
    border: 2px solid #4a5568;
    border-radius: 50%;
    position: relative;
    transition: all var(--exam-transition);
    flex-shrink: 0;
}

.q-option-btn input[type="radio"] {
    position: absolute;
    opacity: 0;
    width: 0;
    height: 0;
}

.q-option-btn.is-checked,
.q-option-btn:has(input:checked) {
    background: rgba(74, 158, 255, 0.08);
    border-color: #3182ce;
    box-shadow: 0 0 10px rgba(74, 158, 255, 0.1);
    color: #fff;
}

/* Fallback: styling the radio circle and text via sibling combinators */
.q-option-btn input[type="radio"]:checked+.q-radio-circle {
    border-color: #4a9eff;
    background: #4a9eff;
    box-shadow: inset 0 0 0 3px #1a1f26;
}

.q-option-btn input[type="radio"]:checked~span {
    color: #fff;
    font-weight: 600;
}

.q-option-btn:has(input:checked) .q-radio-circle {
    border-color: #4a9eff;
    background: #4a9eff;
    box-shadow: inset 0 0 0 3px #1a1f26;
}

/* Blue-accent Instruction Card */
.premium-instruction {
    background: #0f1419;
    border-left: 5px solid #3182ce;
    border-radius: 0 var(--exam-radius-md) var(--exam-radius-md) 0;
    padding: var(--exam-space-lg);
    margin-bottom: var(--exam-space-xl);
}

.premium-instruction .p-title {
    font-weight: 700;
    color: #fff;
    margin-bottom: 8px;
    display: block;
}

.premium-instruction .p-body {
    color: #a0aec0;
    font-size: var(--exam-fs-sm);
    line-height: 1.6;
}

/* ═══════════════════════════════════════════════════════════
   CUSTOM MODALS
   ═══════════════════════════════════════════════════════════ */

.exam-modal-overlay {
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.7);
    backdrop-filter: blur(8px);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 10000;
    animation: modal-fade-in 0.3s ease;
}

.exam-modal {
    background: #1a2029;
    border: 1px solid var(--exam-border);
    border-radius: var(--exam-radius-lg);
    padding: var(--exam-space-xl);
    max-width: 450px;
    width: 90%;
    text-align: center;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.6);
    animation: modal-pop-in 0.3s cubic-bezier(0.34, 1.56, 0.64, 1);
}

.exam-modal h3 {
    margin: 0 0 var(--exam-space-sm) 0;
    color: #fff;
    font-size: var(--exam-fs-xl);
}

.exam-modal p,
.exam-modal-body {
    color: var(--exam-text-secondary);
    margin-bottom: var(--exam-space-xl);
    font-size: var(--exam-fs-sm);
    line-height: 1.6;
}

.exam-modal-actions,
.exam-modal-footer {
    display: flex;
    justify-content: center;
    gap: var(--exam-space-md);
}

.exam-modal .btn-modal {
    padding: 10px 24px;
    border-radius: var(--exam-radius-sm);
    font-weight: 600;
    cursor: pointer;
    font-family: inherit;
    border: none;
    transition: all 0.2s;
}

.exam-modal .btn-cancel {
    background: transparent;
    color: var(--exam-text-secondary);
    border: 1px solid var(--exam-border);
}

.exam-modal .btn-cancel:hover {
    background: rgba(255, 255, 255, 0.05);
    color: #fff;
}

.exam-modal .btn-confirm {
    background: var(--exam-accent);
    color: #fff;
}

.exam-modal .btn-confirm:hover {
    background: var(--exam-accent-hover);
    transform: translateY(-1px);
}

@keyframes modal-fade-in {
    from {
        opacity: 0;
    }

    to {
        opacity: 1;
    }
}

@keyframes modal-pop-in {
    from {
        opacity: 0;
        transform: scale(0.9) translateY(10px);
    }

    to {
        opacity: 1;
        transform: scale(1) translateY(0);
    }
}

/* ═══════════════════════════════════════════════════════════
   UX ENHANCEMENTS: QUESTION NAVIGATOR
   ═══════════════════════════════════════════════════════════ */

.nav-control {
    display: flex;
    align-items: center;
}

.btn-nav-map {
    background: var(--exam-surface-hover);
    color: var(--exam-text);
    border: 1px solid var(--exam-border);
    padding: 6px 14px;
    border-radius: 6px;
    font-size: 0.85rem;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 8px;
    transition: all var(--exam-transition);
}

.btn-nav-map:hover {
    background: var(--exam-surface-active);
    border-color: var(--exam-accent);
}

/* Question Navigator Modal Content */
.nav-grid-container {
    padding: 10px 0;
}

.nav-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(45px, 1fr));
    gap: 12px;
    margin-top: 15px;
}

.nav-tile {
    aspect-ratio: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    background: var(--exam-passage-bg);
    border: 1px solid var(--exam-border);
    border-radius: 8px;
    cursor: pointer;
    transition: all var(--exam-transition);
    position: relative;
    padding: 8px;
}

.nav-tile:hover {
    border-color: var(--exam-accent);
    transform: translateY(-2px);
    box-shadow: var(--exam-shadow-md);
}

.nav-tile.current {
    border-color: var(--exam-accent);
    background: rgba(74, 158, 255, 0.1);
    box-shadow: 0 0 0 1px var(--exam-accent);
}

.nav-tile .page-num {
    font-weight: 700;
    font-size: 1.1rem;
    color: var(--exam-text);
}

.nav-tile .status-dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    margin-top: 4px;
    background: var(--exam-text-muted);
}

.nav-tile.done .status-dot {
    background: var(--exam-success);
    box-shadow: 0 0 6px rgba(52, 211, 153, 0.4);
}

.nav-tile.info .status-dot {
    background: var(--exam-accent);
    box-shadow: 0 0 6px rgba(74, 158, 255, 0.4);
}

.nav-tile.unanswered .status-dot {
    background: var(--exam-text-muted);
}

.nav-legend {
    display: flex;
    flex-wrap: wrap;
    gap: 15px 25px;
    margin-top: 25px;
    padding-top: 15px;
    border-top: 1px solid var(--exam-border);
    font-size: 0.8rem;
    color: var(--exam-text-secondary);
}

.legend-item {
    display: flex;
    align-items: center;
    gap: 8px;
}

.legend-dot {
    width: 10px;
    height: 10px;
    border-radius: 50%;
}

.legend-dot.info {
    background: var(--exam-accent);
}

.legend-dot.done {
    background: var(--exam-success);
}

.legend-dot.unanswered {
    background: var(--exam-text-muted);
}

/* Question Map Responsive Overrides */
@media (max-width: 500px), (max-height: 600px) {
    .exam-modal {
        max-height: 90vh;
        display: flex;
        flex-direction: column;
        padding: var(--exam-space-md) var(--exam-space-lg);
    }
    
    .exam-modal-body,
    .nav-grid-container {
        flex: 1;
        min-height: 0;
        display: flex;
        flex-direction: column;
    }
    
    .nav-grid {
        flex: 1;
        min-height: 0;
        overflow-y: auto;
        gap: 8px;
        grid-template-columns: repeat(auto-fill, minmax(36px, 1fr));
        padding-right: 4px; /* Scrollbar clearance */
        align-content: start;
    }
    
    .nav-tile {
        padding: 4px;
    }
    
    .nav-tile .page-num {
        font-size: 0.95rem;
    }
    
    .nav-legend {
        margin-top: 10px;
        padding-top: 10px;
        gap: 8px 12px;
    }
    
    .nav-legend .legend-item {
        font-size: 0.8rem;
    }
}

/* Fade-in for page transitions */
.exam-page-inner {
    animation: fadeIn 0.3s ease-out;
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(5px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* ═══════════════════════════════════════════════════════════
   SECURITY TOASTS
   ═══════════════════════════════════════════════════════════ */

.security-toast {
    position: fixed;
    bottom: 30px;
    left: 50%;
    transform: translateX(-50%);
    background: rgba(15, 23, 42, 0.95);
    backdrop-filter: blur(12px);
    border: 1px solid rgba(255, 255, 255, 0.1);
    color: #fff;
    padding: 12px 24px;
    border-radius: 50px;
    font-size: 0.9rem;
    font-weight: 500;
    z-index: 10000;
    box-shadow: 0 10px 25px rgba(0, 0, 0, 0.4);
    pointer-events: none;
    transition: all 0.5s cubic-bezier(0.16, 1, 0.3, 1);
    display: flex;
    align-items: center;
    gap: 10px;
}

.security-toast span {
    opacity: 0.95;
}

/* ═══════════════════════════════════════════════════════════
   EMAIL VERIFICATION SLIDE (NATIVE AUTH)
   ═══════════════════════════════════════════════════════════ */

.verify-email-slide {
    max-width: 600px;
    width: 90%;
    margin: auto;
    padding: 40px;
    background: #1a2029;
    /* Solid opaque dark background to fix mobile bleeding */
    border-radius: 24px;
    border: 1px solid var(--exam-border);
    text-align: center;
    box-shadow: 0 30px 60px rgba(0, 0, 0, 0.6);
    animation: modal-pop-in 0.3s cubic-bezier(0.34, 1.56, 0.64, 1);
}

.verify-icon {
    font-size: 44px;
    margin-bottom: 15px;
}

.verify-email-slide h2 {
    font-size: 1.8rem;
    margin-bottom: 12px;
    background: linear-gradient(135deg, #fff, #9ca3af);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
}

.verify-email-slide p {
    color: #9ca3af;
    line-height: 1.6;
}

.verify-form {
    margin-top: 30px;
    text-align: left;
}

.verify-input-group {
    display: flex;
    flex-direction: column;
    gap: 8px;
    margin-bottom: 24px;
}

.verify-input-group label {
    font-size: 0.8rem;
    font-weight: 700;
    color: var(--exam-text-muted);
    letter-spacing: 0.5px;
}

.verify-input-row {
    display: flex;
    gap: 12px;
    align-items: stretch;
}

.verify-input-row input {
    flex: 1;
    padding: 14px 16px;
    border-radius: 12px;
    border: 1px solid var(--exam-border);
    background: rgba(0, 0, 0, 0.2);
    color: #fff;
    font-family: inherit;
    font-size: 1rem;
    transition: all 0.3s;
    min-width: 0;
    /* Prevents flex blowout on mobile */
}

.verify-input-row input:focus {
    outline: none;
    border-color: var(--exam-accent);
    background: rgba(0, 0, 0, 0.4);
    box-shadow: 0 0 0 3px rgba(74, 158, 255, 0.2);
}

.verify-notice-box {
    margin: 24px 0;
    padding: 20px;
    background: rgba(74, 158, 255, 0.08);
    border-left: 4px solid var(--exam-accent);
    border-radius: 12px;
}

.verify-notice-box p {
    color: #fff;
    font-weight: 600;
    font-style: italic;
    font-size: 0.95rem;
    margin: 0;
    line-height: 1.5;
}

.final-actions {
    display: flex;
    gap: 15px;
    margin-top: 30px;
}

.btn-verify {
    flex: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 14px 20px;
    border-radius: 12px;
    border: none;
    font-weight: 700;
    font-family: inherit;
    font-size: 0.95rem;
    cursor: pointer;
    transition: all 0.3s;
}

.btn-update {
    background: rgba(255, 255, 255, 0.08);
    color: #fff;
    border: 1px solid rgba(255, 255, 255, 0.1);
    flex-shrink: 0;
    flex: 0 0 auto;
}

.btn-update:hover {
    background: rgba(255, 255, 255, 0.15);
    border-color: rgba(255, 255, 255, 0.2);
}

.btn-submit-final {
    background: linear-gradient(135deg, #4a9eff, #3b8fee);
    color: #fff;
    box-shadow: 0 8px 20px rgba(74, 158, 255, 0.2);
}

.btn-submit-final:hover {
    transform: translateY(-2px);
    box-shadow: 0 12px 25px rgba(74, 158, 255, 0.3);
}

.btn-cancel-verify {
    background: transparent;
    color: #9ca3af;
    border: 1px solid rgba(255, 255, 255, 0.1);
}

.btn-cancel-verify:hover {
    color: #fff;
    background: rgba(255, 255, 255, 0.05);
}

/* Stack on mobile or handle low height */
@media (max-width: 500px), (max-height: 600px) {
    .verify-email-slide {
        padding: 30px 20px;
        max-height: 90vh;
        overflow-y: auto;
    }

    .verify-email-slide h2 {
        font-size: 1.4rem;
    }

    .verify-input-row {
        flex-direction: column;
    }

    .verify-input-row .btn-update {
        width: 100%;
        padding: 12px 20px;
    }

    .final-actions {
        flex-direction: column;
        gap: 10px;
    }

    .verify-notice-box p {
        font-size: 0.85rem;
    }
}